Fire and police alarm box.



W. F. SMITH.

FIRE AND POLICE ALARM BOX.

APPLICATION man AUGJ. 1912.

COLUMBIA PLANOURAPH cu., WASHINGTON. D. c.

W. F. SMITH.

FIRE AND PoLlcE ALARM Box.

APPLICATION FILED AUGJ.- 1912. v 1,14'?,052. Patented July 20,1915.

3 SHEETS-SHEET 2.

by m4/@41% Affy.

( IDLUMBIA PLANDGRAPH CD.. WASHINGTON, D. C.

W. F. SMITH.

FIRE AND POLICE ALARM BOX. APPLICATION FILED AUGJ!` 1912.

1,147,052.. Pmma July 2o, 1915.

3 SHEETS-SHEET 3.

FIC.

WILLIAM I'. sMITI-I, or BROOKLYN, `ivi-iw Yoan,

ASSIGNOR 'IO WESTERN ELECTRIC COMPANY, `0F NEW YORK, N. Y., ACORPORATION OF ILLINOIS.

Application filedV August 7, 1912. Serial No. 713,740.

T0 all whom it may concern.'

Beit known that I, WILLIAM a citizen of the United States, residing atBrooklyn, in the county of Kings and State of New York, have Vinvented acertain new and'useful Improvement in Fire and Police Alarm Boxes, ofwhich the following is a full, clear, concise, andeXact description.

This invention relates-to Asignal transmitting devices, and isparticularlyadaptable for use in connection with police and fire alarmtelegraph and telephone systems although its use is not limitedexclusively to this field ofoperation.

The general object of this invention is to provide a new and improvedform of signal transmitting device which will transmit -a plurality ofsignals, and which is simple in construction and efficient in operation.

To the above end, this invention co-mprises, 'in its preferred formhereinafter described, a spring-driven train which drives a multiplesignal transmitter, `and means such as a plurality of key mechanisms,for operating the spring-driven train and for controlling the signalimpulses which the transmitter is adapted to produce.

This invention will be fully understood from the following vdescriptiontaken in connection .with the accompanying `drawings in which theinvention is shown as embodied in` a police telegraph and telephone boX.

F. SMITH,

. In the drawings- Figure 1 isa perspective view of afsignaltransmitting device having myl invention embodied therein, the insidedoor of the boX inwhich the mechanism is mounted and the` controllingkeys being shown in dotted lines; Fig. 2 is a top plan view of themechanism shown in Fig. 1;.Fig. 3 is a front elevation thereof; Figs. 4and 5 are front elevations of certain parts of the mechanism; Fig. 6 isa perspective view ofthe police boi;V showing the4 `door thereof in itsopen position; and Fig. l7 shows in perspective the end of the key usedwith the signal transmitter in which this invention is embodied.

. A spring-driven train and the signal transmitting and controllingmechanisms are secured within the housing l against the front wallthereof by means of supporting legs 5 and 6. Two plates 7 and 8, drilledto furnish bearings for the various shafts are held the proper distanceapart by columns `9v and 10, and are rigidly secured to Specification ofLetters Patent. y

Patented Ju1y20, 1915.

the supporting legs 5 and 6. `The shaft 11 is provided with a rides overthe teeth of the ratchet wheel 16,

allowing the driving wheel 14 to remain at rest. Upon therelease of theshaft to allow the spring to unwind, the pawl 15 locks with one of theteeth of the ratchet wheel 16 causing the driving wheel 14 to turn with4 the shaft. A vspring member 17 secured to the driving wheel 14 bearsagainst the plate 8 and serves to keep said driving wheel in such aposition on the shaft that the pawl 15 carried 4thereby may be placed in`operative position to the ratchet wheel 16. y

` The main driving wheel 14 meshes with a `pinion 18 rigidly secured toa shaft 19 imparting motion thereto. The shaft 19 carries in addition tothe pinion 18 a gear wheel 20 and two toothed contact wheels 21 and 22.The gear wheel 2O meshes with a pinion 23 on a shaft 24 which alsocarries an escapement wheel 25. An escapementpawl 26 is provided toengage the teeth ofthe escapement wheel 25 and serves to regulate thespeed of rotation of the spring motor train. A stop lever 27 rigidlysecured to the shaft 11 is adapted to contact with a forward stop pin 28and a backy stop pin 29 which are so spacedl that as the shaft 11rotates from the forward to the back stop the shaft 19 makes onecomplete revolution in the direction indicated by the arrow. The drivingshaft 11 also carries a rigidly attached collar 35 which is milled atits outer end to be engaged by the wards of the proper key inserted inthe keyhole 36 over the projecting pin 37. The key may be similar to theone shown in Fig. 7 except that the long ward 53 may be omitted.

A crank lever 38 riding loosely upon the shaft 11 is secured to theloose crank lever 39 by means of the collar 40 and is adapted to impartmotion thereto, and to actuate and be actuated by the shaft 11 in thefol- Alowing manner: The rigid bearing shaft41 the ward of a keyinserted in key hole 48, and a crank lever 44 secured thereto. A linkmember 45 is Vpivotally connectedl to the cranks 38 and 44 by pins 46and 47, and serves to connect them together. A pin 48 carried by thecrank 38 projects into a slot 49 in the collar 35 and is normally in aposition to contact with the forward end thereof in case the crank 38 isrotated. It will thus be readily apparent that if the collar 42 isrotated, motion is imparted to the shaft 11 through 4the agency of thecranks 38 and 44',` the link 45 and the pin 48. The crank lever 39 isalso caused to rotate through the agency of the connecting collar 40. Onthe return motion of the shaft 11 caused by the unwinding of the Spring,the cranks 38, 39 rotate with the shaft 11, and the crank 44 rotatesabout the rigid shaft 41 since the forward edge of the slot 49 bearsagainst the pin 48. On the other hand, when the spring is wound by a keyoperating on the collar 35, the forward or return movement thereof willnot actuate the cranks 38, 39 and`44 since the pin 48 rides idly in theslot 49.

spring-pressed pawl 50 pivotally secured to the vsupporting leg by meansof av pin 51^is adapted to normally engage a milled Vlug 52 on thecollar 42 preventing its' rotation. This construction makes it necessaryto insert a key with a long ward siinilarto'58, Fig. 7, adapted todisconnect the pawl 50, into the hole of the collar 42 before the springtrain can be wound.

The circuit-closing mechanism consists of the contact wheels 21 and 22and contact brushes 55 and k56 adapted to be engaged by lthe teeththereof. The contact wheel 21 is `provided with a single long tooth 57and the contact ywheel 22 is provided with teeth 58 arranged to transmita code signal. In

:the mechanism shown inthe figures, three sets of four teeth areprovided, but this may be varied to suit the conditions. The contact'brushes 55 and 56 are connected together and supported by, butinsulated from, the frame by screws 59 and constitute one Aside of abreak in the signaling circuit. The

contact ywheels 21 and 22 constitute the other side of the break, and itwill be readily understood that whenever one of the teeth of the wheels21 and 22 contact with one of the brushes 55l and 56 the circuit will beIf a suitable source of energy is inserted into the circuit an impulsewill be imparted into theline when the circuit thus closed.

The contact brush 55 is normally held in a position to be engaged by theteeth of the Vcontact Wheel 22, and when the mechanism `.1`s wound andreleased a code signal, in the `illustrated transmitter 4-4-4, is alwaysproduced. The contact brush 56 is in aline- (i1'ent'"with,`but isnormally held out of enfree end a roller 68 adapted to rotate about thepin 69. The roller 68 normally rests in a saddle 70 of the crank 39 andis subjected to downward pressure by a spring 71;

rIhe spring 71 is secured at one end to the frame by screws 59, the freeend resting on a laterally projecting lug 72 of the link 66. When thecrank 39 is in its normal or ver` tical position the roller 68 rests inthe saddle and holds the link 66 in such a position that the brush 56 isout of engaging `position with the tooth 57 ofthe contact wheel 21. If,however, the crank 39 is rotated about the shaft 11 as hereinbeforedescribed, the saddle support is removed from beneath Athe roller 68 andthe downward pressure of the spring 71 causes the link 66 to be lowereduntil the brush 56 is in operative relation to the tooth 57. Upon thereturn movement of the spring-driven train, both brushes 55 and 56contact with the teeth of their respective contact wheels 21 and 22. Thecrank 39 in returning to its normal position raises the link 66 so thatthe brush 56 after contacting with the tooth 57 is-removed lfromoperative relation therewith until again released as being held out ofengaging position with the contact wheel 21, the signal 4-4-4 istransmitted.

If it is desired to transmit a different signal, as, for example, anemergency signal, a key with a long ward is inserted in the keyhole 43vand given a turn to the right as before. The spring is again wound andthe brush 56 is lowered to a position to be struck by the tooth 57 Thekey should then be released to allow the spring train to unwind asbefore and since both brushes 55 and 56 are in operative relation to theteeth of their respective wheels, the signal is transmitted preceded byan impulse of longer duration.

I claim-` Arcurrent impulse transmitter comprising a spring-drivenescapementeregulated 'mech- 136 Gopies of this patent may be obtainedfor ve cents each, by addressing the ing the second brush to move intooperative relation to its contact Wheel, and a springpressed pawl fornormally locking said second-mentioned shaft.

In Witness whereof, I hereunto subscribe my name this 1st day of AugustA. 11,1912.

WILLIAM F. SMITH.

Witnesses:

R. C. HoPGooD, H. H. TIMBERS.

Commissioner of Patents,

Washington, D. C.

